/*
 * Copyright 2015, The Querydsl Team (http://www.querydsl.com/team)
 *
 * Licensed under the Apache License, Version 2.0 (the "License"); you may not use this file except
 * in compliance with the License. You may obtain a copy of the License at
 * http://www.apache.org/licenses/LICENSE-2.0 Unless required by applicable law or agreed to in
 * writing, software distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
 * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the License for the specific
 * language governing permissions and limitations under the License.
 */
package com.querydsl.jpa;

import com.mysema.commons.lang.CloseableIterator;
import java.util.Iterator;
import java.util.List;
import java.util.NoSuchElementException;

/**
 * {@code ScrollableResultsIterator} is a {@link CloseableIterator} adapter for ScrollableResults
 *
 * @author tiwe
 * @param <T>
 */
public class ScrollableResultsIterator<T> implements CloseableIterator<T> {

  private final Iterator<T> results;

  public ScrollableResultsIterator(List<T> results) {
    this.results = results.iterator();
  }

  @SuppressWarnings("unchecked")
  @Override
  public boolean hasNext() {
    return results.hasNext();
  }

  @Override
  public T next() {
    if (results != null) {
      return results.next();
    } else {
      throw new NoSuchElementException();
    }
  }

  @Override
  public void remove() {
    throw new UnsupportedOperationException();
  }

  @Override
  public void close() {
    // do nothing
  }
}
